Name the enzyme that facilitates opening of $DNA$ helix during transcription.
$RNA$ polymerase
$DNA$ ligase
$DNA$ helicase
$DNA$ polymerase
In the process of transcription sigma factor is important for
Which form of $RNA$ is most heterogeneous
Reverse transcriptase:
If there are $81\; million$ bases in $RNA$ of human cell, then calculate the total number of introns present in $cDNA$
New strand on a $DNA$ template is initiated by